High Power 4:1 Unun for multiband monopole rod and wire antennas
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High Power 4:1 Unun for multiband monopole rod and wire antennas
High Power 4:1 Unun for multiband monopole rod and wire antennas
Description
High Power 4:1 Unun for multiband monopole rod and wire antennas
o bring the impedance within the range of a good external or built-in asymmetric antenna tuner, a 4:1 UNUN (Unbalanced to Unbalanced) impedance transformer is used as a pre-match unit.
The UNUN ensures reasonably low VSWR values on the coaxial feedline, minimizing excessive losses. As with any vertical antenna, the efficiency and radiation pattern largely depend on the radial field beneath the antenna. This can range from a simple grounding rod in temporary or emergency setups to an extensive radial plane in more permanent installations.
The UNUN can, with a conservative margin, withstand 1200 Watts PeP, even under mismatched conditions.
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